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Does the 2004 Ford Focus ZTS with 2.3 liter engine have a timing chain and if so what is change interval?

The 2004 Ford Focus ZTS with the 2.3L Duratec engine uses a timing belt, not a timing chain. There is no change interval in the sense of replacing a chain. Timing belts, however, require replacement at a specified interval.

For a 2004 Ford Focus ZTS with the 2.3L engine, the recommended timing belt replacement interval is generally 100,000 miles or 10 years, whichever comes first. However, it's crucial to check your owner's manual for the precise recommendation from Ford for your specific vehicle. This interval can vary slightly depending on driving conditions and maintenance history. Ignoring this recommendation can lead to catastrophic engine damage if the belt breaks.